/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Party/PartyTypes.h
enum EPartyJoinDenialReason { NoReason = 0, JoinAttemptAborted, Busy, OssUnavailable, PartyFull, GameFull, NotPartyLeader, PartyPrivate, JoinerCrossplayRestricted, MemberCrossplayRestricted, GameModeRestricted, Banned, NotLoggedIn, CheckingForRejoin, TargetUserMissingPresence, TargetUserUnjoinable, TargetUserAway, AlreadyLeaderInPlatformSession, TargetUserPlayingDifferentGame, TargetUserMissingPlatformSession, PlatformSessionMissingJoinInfo, FailedToStartFindConsoleSession, MissingPartyClassForTypeId, TargetUserBlocked, InvalidJoinInfo, NotFriends, CustomReason0, CustomReason1, CustomReason2, CustomReason3, CustomReason4, CustomReason5, CustomReason6, CustomReason7, CustomReason8, CustomReason9, CustomReason10, CustomReason11, CustomReason12, CustomReason13, CustomReason14, CustomReason15, CustomReason16, CustomReason17, CustomReason18, CustomReason19, CustomReason20, CustomReason21, CustomReason22, CustomReason23, CustomReason24, CustomReason25, CustomReason26, CustomReason27, CustomReason28, CustomReason29, CustomReason30, CustomReason31, CustomReason32, CustomReason33, CustomReason34, CustomReason35, CustomReason36, CustomReason37, CustomReason38, CustomReason39, MAX, }